| Property and Equipment |
Property and Equipment
Property and equipment, net consists of the following (in millions): | | | | | | | | | | December 31, | | 2019 | | 2018 | Land | $ | 1,097 |
| | $ | 899 |
| Buildings | 11,226 |
| | 7,401 |
| Leasehold improvements | 3,112 |
| | 1,841 |
| Network equipment | 17,004 |
| | 13,017 |
| Computer software, office equipment and other | 1,813 |
| | 1,187 |
| Finance lease right-of-use assets | 1,635 |
| | — |
| Construction in progress | 10,099 |
| | 7,228 |
| Total | 45,986 |
| | 31,573 |
| Less: Accumulated depreciation | (10,663 | ) | | (6,890 | ) | Property and equipment, net | $ | 35,323 |
| | $ | 24,683 |
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Depreciation expense on property and equipment were $5.18 billion, $3.68 billion, and $2.33 billion for the years ended December 31, 2019, 2018, and 2017, respectively. The majority of the property and equipment depreciation expense was from network equipment depreciation of $3.83 billion, $2.94 billion, and $1.84 billion for the years ended December 31, 2019, 2018, and 2017, respectively. Construction in progress includes costs mostly related to construction of data centers, network equipment infrastructure to support our data centers around the world, and office buildings. No interest was capitalized for any period presented.
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